Wet flies primarily represent emerging or drowned insects. So if you are imitating a #16 sulfur or #18 BWO I think you should make a wet fly that size. The [url=http://home.att.net/~ferenc/Tie-rs22.htm:2b286]RS2[/url:2b286] is a wet fly imitating emergers so can be any size. Think BUG, not Fly Tying Catalogue.